Lighting device with organic light emitting diode

ABSTRACT

A lighting device for motor vehicles designed to emit light in a main direction of emission. The lighting device has at least one vane mounted with the ability to move in the lighting device, the vane having a panel on which at least one area light source is arranged.

This application claims priority to the French application 1558329,filed Sep. 8, 2015, which application is incorporated herein byreference and made a part hereof.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to the field of lighting devices for motorvehicles.

2. Description of the Related Art

In the known way, this type of device is tending to become more complexbecause of the increasing number of functions that these devices arecalled upon to implement. Notably listed among these functions is thecreation of switch-on sequences, for example when the vehicle is startedup, which offer a particular aesthetic look. This aesthetic look notablycontributes to defining the overall appearance or “visual signature” ofthe vehicle in question, and differentiates it from other vehicles.

SUMMARY OF THE INVENTION

In this context, the invention seeks to offer a lighting device formotor vehicle that makes it possible to define a particular visualsignature for this vehicle while at the same time having optimizedcompactness, reliability and design.

To this end, the invention relates to a lighting device for motorvehicles, the lighting device being designed to emit light in a maindirection of emission and comprising at least:

a vane mounted with the ability to move in the lighting device, the vanehaving a panel on which at least one area light source is arranged.

An “area light source” means a source that has a light emission surfaceand the thickness of which is negligible in comparison with thedimensions of this light emission surface.

According to one aspect of the invention, the or at least one area lightsource is an organic light emitting diode covering all or part of thesurface of the panel of the corresponding vane.

If appropriate, the light emitting surface area of the OLED may begreater than 1 cm².

As an alternative, the area light source may be a lighting panel formedby a collection of optical fibers, notably juxtaposed, braided orintermingled fibers, the optical fibers being associated with one ormore light sources, notably comprising one or more light emitting diodesLED. If appropriate, the light source or sources may be designed to emitlight in the ends of the optical fibers, the optical fibers beingdesigned to diffuse this light via outlet faces of these fibers formedon their envelope over all or part of their length, the collection ofthe outlet faces thus together forming the area light source, in thiscase also referred to as FOLED.

According to one aspect of the invention, the device further comprisesat least one mount fixedly mounted on the lighting device, the vanebeing mounted with the ability to move on the mount, and the lightingdevice further comprises an actuating device configured to cause thevane to move with respect to the mount between a rest position and anemission position.

For example, the mount is fixed to a housing of the lighting devicewhich delimits a cavity in which the components of the device arearranged.

According to one aspect of the invention, the vane is articulated to themount, the area light source being suited to emitting light in a favoreddirection of radiation, and the actuating device is suited to causingthe vane to pivot with respect to the mount between the rest positionand the emission position in which the favored direction of radiation ofthe area light source is close to the main direction of emission orcorresponds more or less to the main direction of emission of thelighting device.

In one exemplary embodiment, the vane is articulated to the mount so asto pivot about a horizontal axis. This horizontal axis is, for example,orthogonal to the main direction of emission of the lighting device.

According to one aspect of the invention, in the emission position, theangular difference between the main direction of emission and thefavored direction of radiation of the vane is less than 50°, or evenless than 15°.

According to one aspect of the invention, in the rest position, thelight source of the or each vane is visible in the direction ofemission.

According to one aspect of the invention, the angular distance betweenthe rest position and the emission position of the vane is greater than40°.

According to one aspect of the invention, the device comprises at leasttwo vanes each having a panel on which is arranged at least one arealight source, there being associated with each mount two vanes which aremounted with the ability to move on the mount and arranged on the mountsymmetrically with respect to one another about the main direction ofemission.

Advantageously, the actuating device is designed to cause the twoassociated vanes to move simultaneously.

According to one aspect of the invention, the actuating device comprisesan actuator and a moving part to which the or each vane associated withthe relevant mount is articulated, the actuator being suited to movingthe moving part with respect to the mount in such a way as to cause eachvane associated with the relevant mount to pivot simultaneously withrespect to the mount between the rest position and the emissionposition.

According to one aspect of the invention, each mount comprises at leastone guide groove in which the moving part of the corresponding actuatingdevice can move.

The guide groove is fixedly mounted in the lighting device.

According to one aspect of the invention, the movement of the movingpart by means of which movement the vane is pivoted with respect to themount is a translational movement.

According to one aspect of the invention, each vane comprises aconnecting arm of which a first end is fixed to the relevant panel, andof which a second end is, on the one hand, fixed to the relevant mountvia a first axis and, on the other hand, fixed to the associated movingpart via a second axis.

For example, the second end is fixed to the walls of the guide groove.

According to one aspect of the invention, the second end of theconnecting arm comprises an orifice to accept the second axis, theorifice having a cylindrical overall shape of oblong cross section.

According to one aspect of the invention, the actuator comprises amotor, a link rod connected to the motor and a connecting actuatingcylinder connecting the link rod to the moving part.

However, as an alternative, the actuator comprises a shape-memory wireassociated with a spring.

According to one aspect of the invention, the device comprises at leasttwo mounts which are fixed with respect to the housing and the devicefurther comprises a framework that is fixed relative to the housing andon which the or each mount is arranged, the mounts being spaced apartalong the framework.

Advantageously, the device comprises at least one vane mounted with theability to move on each mount and on which at least one area lightsource is arranged.

According to one aspect of the invention, the device further comprises acontrol unit suited to causing each vane to move according to anactuation sequence during the course of which the vanes associated withdifferent mounts are moved between their rest and emission positionssequentially from one mount to another in a given direction of travelover the framework.

Advantageously, the control unit is also designed to control theswitching-on of the area light sources.

For example, the control unit is configured to switch each area lightsource on in parallel with the movement of the vane on which it isarranged. As an alternative, the control unit may be designed to switchall of the area light sources on prior to the movements of the vanes.According to one example, all of the area light sources may be arrangedso that together they form a scrolling turn signal function.

According to one aspect of the invention, the framework delimits acavity and the lighting device further comprises a lighting modulecomprising at least one light guide of elongate shape extending into thecavity delimited by the framework.

The invention also relates to a method for using a as defined above, themethod involving:

switching on at least the light source, the light source forming a filmof light covering all or part of the panel of the relevant vane.

According to one aspect of the invention, the method further involvesmoving the or at least one vane between the rest position and theemission position by means of the actuating device.

According to one aspect of the invention, the method involves:

switching on all of the light sources of the lighting device; and

moving each vane between the rest position and the emission position,the vanes associated with a given mount being pivoted simultaneously,the vanes respectively associated with different mounts being pivotedwith a temporal offset in a predefined order along the framework.

According to one aspect of the invention, the vanes associated withdifferent mounts are pivoted between their rest and emission positionssequentially from one mount to another in a given direction of travelover the framework.

These and other objects and advantages of the invention will be apparentfrom the following description, the accompanying drawings and theappended claims.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

The invention will be more clearly understood from reading the detaileddescription which will follow, which is given solely by way of exampleand with reference to the attached figures in which:

FIG. 1 is a schematic illustration of a lighting device according to theinvention;

FIGS. 2a and 2b are views of the lighting device of FIG. 1;

FIG. 3 illustrates a vane of the lighting device;

FIG. 4 illustrates a moving part of the lighting device of FIG. 1; and

FIG. 5 is a block diagram of a method of using the lighting deviceaccording to the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1 illustrates a lighting device according to the invention.

FIG. 1 illustrates a device 2 according to the invention. The device 2is a lighting device for motor vehicle lighting or signaling. Forexample, the device 2 is a vehicle main headlamp, a high-beam headlight,a low-beam headlight, a turn signal or a tail light.

In the example of FIG. 1, the device 2 is a tail light.

The device 2 is suited to emitting light in a main direction of emissiondenoted X.

The device 2 comprises a housing 4, an outer lens 6 and a light emittingmodule 8, hereinafter module 8.

The housing 4 internally delimits a cavity 10 in which the module 8 isarranged. The cavity 10 is closed off at the front by the outer lens 6.

The housing 4 and the outer lens 6 are made, for example, from knownmaterials using a known method of manufacture.

The module 8 comprises a framework 12, at least one mount 14, at leastone vane 16 suited to emitting light, and at least one actuating device18 configured to cause the vane 16 to move. Furthermore, the module 8comprises a lighting module 20 and a control unit 21.

The framework 12 is fixed to the housing 4. The framework 12 takes theform of an elongate component which is in the overall shape of a U incross section. It thus delimits on the inside a cavity 22 to which thelighting module 20 is attached, as described hereinafter. It may benoted that the cavity 22 is, in certain embodiments, also used for thepassage of the connections for the device 2, particularly theconnections needed to supply electrical power to the various componentsof the device 2.

The framework 12 extends substantially horizontally between the lateralwalls of the housing 4, to which walls it is fixed. It is arrangedinside the housing 4 in such a way that the cavity 22 is open toward thefront of the device 2.

It will be noted that, in certain embodiments, the framework 12 iscurved, its curvature being oriented toward the rear of the device 2.

The framework 12 is made for example from a mask of the device 2 usedfor concealing the unaesthetic parts such as the wiring harnesses, and apart of which is designed to accept mounts 14.

With reference to FIGS. 1, 2 a and 2 b, the device 2 comprises aplurality of mounts 14 fixedly mounted in the device 2. In the exampleof the figures, these are fixed to the housing 4, by means of theframework 12, such that the mounts 14 are unable to move with respect tothe housing 4 of the device 2.

The mounts 14 are offset from one another along the framework 12. Forexample, they are evenly spaced apart.

In the example of FIG. 1, the device 2 comprises five mounts 14.

Associated with each mount 14 is at least one vane 16. Advantageously,each mount 14 has, associated with it, at least two vanes 16 which arearranged symmetrically relative to one another about the direction X.Advantageously, the actuating device 18 is then configured to cause thevanes 16 associated with a given mount 14 to move simultaneously.

Each mount 14 has the overall shape of a U. In other words, each mount14 has two legs 14J and a central portion 14C joining the two legs 14J.The two legs 14J are substantially parallel to one another.

The dimensions of the U-shaped cross section of each mount 14 more orless complement that of the U-shaped cross section of the framework 12.Each mount 14 is fitted onto the framework 12 and fixed thereto.

With reference to FIG. 2a , each mount 14 comprises a guide groove 14Gfor guiding a moving part 28 of the actuating device 18.

Because of the fixed nature of the mounts 14 with respect to the device2, the guide grooves 14G are fixed within the device 2.

The guide groove 14G is formed in the thickness of the mount 14.Advantageously, this guide groove 14G extends all around the peripheryof the mount 14.

The guide groove 14G takes the form of a removal of material performedover a portion of the thickness of the mount 14. The guide groove 14Gthus forms a channel in the flanks of the legs 14J and of the centralportion 14C. It further delimits two rims 14R (FIG. 2a ) of the relevantmount 14.

Furthermore, the free end of each leg 14J of each mount 14 comprisespassages housing a first rotation axis A1. As described hereinafter, thevanes 16 associated with each mount 14 are articulated to the mount 14by means of this axis A1.

Advantageously, the rims 14R of the central portion 14C are providedwith an aperture in order to provide access to the articulation thatarticulates the moving part mentioned hereinabove to the rest of theactuating device 18.

The mounts 14 are advantageously made with a material that offers a lowcoefficient of friction so as to minimize the effort required from theactuator.

With reference to FIGS. 2a, 2b and 3, each vane 16 is articulated to theassociated mount 14 via the first rotation axis A1 describedhereinabove. Furthermore, each vane 16 is articulated to the moving part28 mentioned hereinabove.

Each vane 16 has a panel 16P and a connecting arm 16B.

The panel 16P takes the form of a support of given surface area. Thepanel 16P is, for example, substantially planar. Alternatively, thepanel 16P may have a slightly curved shape. Alternatively or inparallel, the panel 16P may have various portions forming an anglebetween them. These portions are, for example, formed as integral partswith one another or, alternatively, fixed to one another.

Furthermore, the panel 16P has a surface of any shape. In the example ofFIG. 3, the panel 16P is in the overall shape of an L.

Each panel 16P is suited to emitting visible light in a favoreddirection of radiation denoted Y.

The direction Y corresponds for example to a direction normal to thepanel 16P. This normal is, for example, the normal to the central partof the panel 16P when the latter has a uniform curvature. In otherembodiments in which the panel 16P has portions forming angles betweenthem, this direction corresponds for example to the normal to a chosenportion of the panel 16P.

This chosen portion is, for example, the portion that makes the smallestangular distance with the direction X.

To this end, each panel 16P comprises at least one light source 16S.

In the context of the invention, the light source 16S is an area lightsource. As indicated hereinabove, that means a light source having alight emitting surface area and the thickness of which is negligible incomparison with the dimensions of this light emitting surface area.

Advantageously, the light source 16S of at least one of the panels 16Pis a photoemissive semiconductor element of organic type. This type ofphotoemissive element is an organic light emitting diode known by itsEnglish-language acronym OLED, which stands for “Organic Light EmittingDiode”.

The light source 16S forms a photoemissive film arranged on the panel16P. The light source 16S covers all or part of the surface of the panel16P. Advantageously, the light source 16S covers more or less theentirety of the surface of the panel 16P.

The light source 16S is, for example, fixed to the panel 16P by bonding.

The light source 16S is, for example, suited to emitting light that isred, or even orange, in color.

The connecting arm 16B is designed for connecting the vane 16 to theassociated mount 14 and to the moving part 28 mentioned hereinabove.

The connecting arm 16B thus has a first end 16B1 fixed to the panel 16P.Advantageously, this fixing is performed at the rear of the panel 16P.

The connecting arm 16B also has a second end 16B2 for articulating thevane 16 to the mount 14 via the first rotation axis A1 describedhereinabove, and for articulating the vane 16 to the moving part 28 viaa second axis A2.

To this end, the second end 16B2 comprises a first orifice 24 forhousing one of the first axes A1 of the relevant mount 14. The firstorifice 24 is of cylindrical overall shape with substantially circularcross section.

Advantageously, the first axes A1 are arranged horizontally (withrespect to the orientation of the figure). In the example of thefigures, the axes A1 are thus orthogonal to the direction of emission X.The vanes 16 are therefore suited to pivoting about an axisperpendicular to the main direction of emission X.

Furthermore, the second end 16B2 of the connecting arm 16 furthercomprises a second orifice 26 for housing the second axis A2.

Advantageously, the second orifice 26 has a cylindrical overall shape ofoblong cross section. In certain embodiments, this oblong cross sectionis rectilinear. As an alternative, this oblong cross section is curved.

The shape of the cross section of this second orifice 26 has the effectof allowing the vane 16 to rotate under the effect of a translationalmovement imparted to the moving part 28 of the actuating device 18.

Advantageously, the second end 16B2 is fixed to the corresponding mount14 at the level of the guide groove 14G, and more specifically at thelevel of the rims 14R that delimit same. This fixing is, for example,achieved at a region that the moving part 28 cannot reach during itsmovements. For example, it is achieved at protuberances that the rimshave and that extend laterally to the spread of the corresponding leg14J, at the free end of this leg 14J (FIGS. 2a and 2b ).

Referring once again to FIGS. 2a and 2b , the device 2 comprises, foreach mount 14, an actuating device 18. Each actuating device 18 isconfigured to cause the vane or vanes 16 associated with the relevantmount 14 to move with respect to this mount 14 between a rest positionillustrated in FIG. 2a and an emission position illustrated in FIG. 2 b.

In the emission position, the panel 16P of the vanes 16 more or lessfaces the emission direction X. The panel 16P can therefore be seen inthe direction of emission X at an angle that is not a glancing angle.

In the rest position, the panel 16P of the vanes 16 does not face thedirection of emission X. For example, it is then hidden by the framework12 and is not visible. Alternatively, in the example of the figures, inthe rest position, the panel 16P of the vanes 16 is visible in thedirection X at an angle that is a small or even a glancing angle.

In other words, in the emission position, the favored direction ofradiation Y of a given vane 16 is close to the direction X orcorresponds more or less to the direction X.

Within the meaning of the present invention, “close to” means that theangular distance in terms of absolute value between the directions X andY is less than or equal to 50°. Advantageously, this angular distance isless than 15°.

The angular distance is considered in the plane of FIG. 1. For example,this angular distance is substantially equal to 25°. This angulardistance corresponds to the angle of elevation of the favored directionof radiation Y of the vane with respect to the main direction ofemission X of the device 2, and corresponds to the oriented angleidentified by the vectors {right arrow over (x)} and {right arrow over(y)} in FIG. 1.

In the rest position, the angular distance between these directions isgreater than or equal to 70°. It has, for example, the value 75°.

Other angular configurations in either one of these positions arepossible.

In general, the angular distance between the rest and emission positionsis advantageously greater than or equal to 40°, and preferably greaterthan or equal to 50°. The angular distance chosen is then obtained byselecting notably the shape and dimensions of the cross section of thesecond orifice 26 of the panel 16 and the length of travel of the movingpart 28.

As indicated previously, the actuating device 18 is configured to causeat least one vane 16 to move.

More specifically, associated with each mount 14 is an actuating device18 suited to causing the two vanes 16 associated with the relevant mount14 to move. Advantageously, the actuating device 18 is then configuredto cause the two vanes 16 associated with the relevant mount 14 to movesimultaneously.

Each actuating device 18 comprises a moving part 28. Furthermore, itcomprises an actuator, or drive mechanism 30.

With reference to FIG. 4, the moving part 28 has the overall shape of aU. It thus comprises two parallel legs 28J and a central or connectingportion 28C connecting the two legs 28J.

The moving part 28 has dimensions, particularly in terms of the spacingbetween the two legs 28J, that more or less complement those of theguide groove 14G of the mount 14.

Each moving part 28 is coupled to a given mount 14. Each moving part 28is more specifically fitted over the corresponding mount 14 in such away that their respective U-shapes coincide. Each moving part 28 canalso move in the corresponding guide groove 14G in a translationalmovement.

In this translational movement, the legs 28J of the moving part 28 slidein the guide groove 14G along the legs 14J of the corresponding mount14, as illustrated in FIGS. 2a and 2b . During this movement, thecentral or connecting portion 28C of the moving part 28 moves, remainingsubstantially parallel to the central or connecting portion 14C of themount 14.

The free end of each leg 28J comprises a passage opening 28P to housethe second axis A2 (FIG. 4) which is also housed in the second orifice26 of the vanes 16 associated with the relevant mount 14.

The central portion 28C of the moving part 28 comprises two projectionseach comprising a passage orifice 28O. The passage orifices 28O arearranged facing one another and are designed to house an axis A3 (FIG.2b ) that allows the moving part 28 to be articulated to the drivemechanism 30.

The drive mechanism 30 in question comprises a motor 33, a connectingactuating cylinder 34 and a link rod 36.

The motor 33 is configured to cause the link rod 36 to rotate as itoperates.

The connecting actuating cylinder 34 kinematically connects the movingpart 28 to the motor 33 and to the link rod 36.

It has a cylinder 34C in which there is arranged a mobile piston (notdepicted) bearing a rod 34T the free end of which is fixed to the linkrod 36. The cylinder 34C of the actuating cylinder 34 is itself fixed tothe moving part 28 via the axis A3.

The link rod 36 is configured to actuate the connecting actuatingcylinder 34 and the moving part 28 when the motor 33 is in operation.

With reference to FIG. 1, the lighting module 20 is configured toperform a specific lighting function of the device 2. In the example ofthe figures, the lighting module 20 is thus configured to perform thetail light lighting function.

To this end, the lighting module 20 comprises at least one light guide40. In the example of the figures, the lighting module 20 comprises twolight guides 40 and 42. The light guides 40, 42 have an elongate overallshape and extend into the cavity 22 delimited by the framework 12.

The first light guide 40 has, for example, a circular cross section.

The second light guide 42 has, for example, a cross section that issomething other than circular.

The two light guides 40, 42 are coupled at one of their ends to a lightsource (not depicted) which injects into the light into thecorresponding guide. These light guides 40, 42 moreover have prisms inthe form of reliefs formed in their surface, for example at their rearpart, and configured to deflect the light traveling along thecorresponding guide into the direction X.

The lighting module 20 further comprises a closure outer lens 44configured to confer a particular appearance upon the light emitted bythe light guides 40, 42.

For example, the closure outer lens 44 has opalescent properties.

The control unit 21 is configured to control the various actuatingdevices 18 of the device 2. In the embodiment of the figures, it isconfigured in particular to control the switching-on of the motors 33 ofthe actuating devices 18.

Advantageously, it is also configured to control the switching-on andswitching-off of the light sources 16S borne by the various vanes 16.

For example, the control unit 21 is configured to switch each lightsource 16S on and, at the same time as switching on a given light source16S, to command the movement of the vane 16 on which it is arranged.

As an alternative, the control unit 21 is configured to switch all ofthe light sources 16S on prior to the movements of the vanes 16.

According to one exemplary embodiment, the control unit 21 is configuredto switch the collection of area light sources 16S on and/or off inorder to create a scrolling turn signal function.

The control unit 21 comprises for example a programmablemicrocontroller.

It will be noted that the control unit 21 is, for example, situated inthe device 2. Alternatively, it is situated outside the device 2.

Advantageously, the control unit 21 is configured to cause each vane 16to pivot in an actuating sequence during which the vanes 16 associatedwith various mounts 14 are pivoted between their rest and emissionpositions sequentially from one mount 14 to another in a given directionof travel over the framework 12.

The way in which the device 2 works will now be described with referenceto the figures.

In an initial configuration, the light sources 16S are switched off, asare the light guides 40, 42.

Furthermore, the vanes 16 are in the rest position.

The following steps are performed for example in response to detectionof a particular event. For example, they are performed following theswitching-on of the vehicle on which the device 2 is mounted. In thatsense, the following method forms what is generally referred to by itsEnglish name as a “welcome scenario”.

During an initial step S1, the control unit 21 commands the switching-onof all or some of the light sources 16S. The light sources 16S then formlighting films covering all or part of the panel 16P of the relevantvane 16.

More specifically, the switching-on of the light sources 16S isperformed by the control unit 21 in a predetermined switch-on sequence,as mentioned above.

In one example of a sequence, the light sources 16S are switched onsequentially one after another gradually in a given direction of travelover the framework 12.

In other words, the control unit 21 commands the switching-on of thelight sources 16S associated with the two vanes 16 borne by a mount 14situated at one end of the framework 12. Then, keeping these lightsources 16S switched on, the vanes 16 of the next nearest mount 14 areswitched on, and so on, until all of the light sources 16S of the device2 have been switched on.

Note that for switching on the light sources 16S, the control unit 21commands the application of power from a source of electrical energy(not depicted) to the light sources 16S.

Once all of the light sources 16S have been switched on, or indeed inparallel with this switch-on sequence, during a step S2, the vanes 16are pivoted in a predetermined sequence.

During this sequence, the vanes 16 are pivoted sequentially one afteranother gradually in a given direction of travel over the framework 12.This direction is, for example, the same as the direction seen duringstep S1. Alternatively, it is the opposite direction.

In other words, the control unit 21 commands the actuating device 18associated with a mount 14 situated at one end of the framework 12 tomove the two vanes 16 of this mount 14 from the rest position into theemission position.

This movement is then demanded of the actuating device 18 of the nextnearest mount 14, and so on, until all the vanes 16 have moved into theemission position.

Note that the pivoting of the vanes 16 associated with a mount 14 may beinitiated when the vanes 16 associated with the previous mount 14(within the meaning of the direction of travel over the framework 12being considered) have not yet reached their emission position.

For this movement of the vanes 16 of a given mount 14 into the emissionposition, the control unit 21 commands the switching-on of the motor 33of the relevant actuating device 18. The associated link rod 36 istherefore made to move. The rod 34T is therefore moved such that theassociated piston comes to the end of its travel in the relevantcylinder 34C and applies a pull to the moving part 28 to which it isfixed.

This pull results in the translational movement of the moving part 28relative to the associated mount 14 in a translational movement parallelto the direction of the legs 14J of the mount 14 in the guide groove14G.

As this happens, the walls of the passage openings 28P at the end of theleg 28J pull on the two corresponding axes A2. These axes A2 move in thecorresponding second orifice 26 of the associated vanes 16, causingthese vanes 16 to rotate about their axis A1 and causing the panel 16Pof these vanes 16 to rotate from the rest position into the emissionposition.

Once the vane pivot sequence is complete, during a step S3, the vanes 16are returned to the rest position and the light sources 16S are switchedoff. To do that, the control unit 21 commands the actuating devices 18to effect the translational movement of the moving parts 28 in thedirection of the mounts 14. For a given moving part 28, thistranslational movement causes the piston of the associated actuatingcylinder 34 to move to the end of the cylinder 34C, then causes thecylinder 34C to move toward the mount 14, thereby causing thetranslational movement of the moving part 28 in the guide groove 14G ofthe corresponding mount 14. The axes A2 borne by the mount 14 are movedin the second orifice 26 then urge the connecting arm 16B of the vane 16to cause the vanes 16 to pivot toward their rest position.

This step is optionally conducted according to a predetermined sequence.This sequence for example involves sequentially or simultaneouslyswitching off the light sources 16S and pivoting the vanes 16, theseactions being conducted in a chosen order.

In parallel with one or more of these steps or, alternatively, afterthese steps, the lighting module 20 is commanded to emit by the controlunit 21, in order to achieve the corresponding lighting function. In theexample of the figures, the lighting module 20 is, for example,commanded to emit in response to a braking of the vehicle.

The device 2 according to the invention offers several advantages.

In particular, it allows an improved light signature to be achievedthrough the movement of lighting surfaces, throughout this exhibiting astyle that is robust, compact and simple.

Furthermore, it relies on the conversion of a translational movementinto a rotational movement in order to cause the vanes 16 to move.

Furthermore, the light sources 16S in themselves contribute to improvingthe appearance of the device 2 because of their OLED nature.

At the same time, the moving elements of the device 2 and the actuatingdevices 18 do not impede the performance of the other functions of thedevice 2, such as the regulation tail light function when the device 2is a motor vehicle tail light.

Other embodiments are conceivable.

In particular, as an alternative, the actuating device 18 causes a vane16 to pivot by means of a shape-memory wire and of a spring. Theshape-memory wire is associated with one direction of rotation of thevane 16, the spring being associated with the opposite direction ofrotation.

This wire and spring for example replace the link rod 36, the motor 33and the connecting actuating cylinder 34. The control unit 21 is thenconfigured to command the supply of electrical power to the shape-memorywire in order to raise the temperature thereof and cause it to revert tothe memorized shape, and to interrupt this application of power in orderto lower the temperature thereof and allow it to deform, so that thevane 16 can pivot under the influence exerted by the spring.

While the system, apparatus, process and method herein describedconstitute preferred embodiments of this invention, it is to beunderstood that the invention is not limited to this precise system,apparatus, process and method, and that changes may be made thereinwithout departing from the scope of the invention which is defined inthe appended claims.

What is claimed is:
 1. A lighting device for motor vehicles, said lighting device being designed to emit light in a main direction of emission (X) and comprising: at least one vane mounted with the ability to move in said lighting device, said at least one vane being coupled to a panel on which at least one area light source is arranged and which moves with the vane from an emission position to a rest position via a connecting arm, wherein said at least one area light source is visible in the main direction of emission (X) when in the emission position and non-visible in the main direction of emission (X) when in the rest position.
 2. The lighting device according to claim 1, wherein said at least one area light source is an organic light emitting diode covering all or part of a surface of said panel of said at least one vane.
 3. The lighting device according to claim 1, wherein said lighting device further comprises at least one mount fixedly mounted in said lighting device, said at least one vane being mounted with the ability to move on said at least one mount, and in that said lighting device further comprises an actuating device configured to cause said at least one vane to move with respect to said at least one mount between a rest position and the emission position.
 4. The lighting device according to claim 3, wherein said at least one vane is articulated to said at least one mount, said at least one area light source being suited to emitting light in a favored direction of radiation (Y), and in that said actuating device is suited to causing said at least one vane to pivot with respect to said at least one mount between said rest position and said emission position in which said favored direction of radiation (Y) of said at least one area light source is close to said main direction of emission (X) or corresponds more or less to said main direction of emission (X) of said lighting device.
 5. The lighting device according to claim 4, wherein said lighting device comprises at least two vanes each of said at least two vanes having a panel on which is arranged at least one area light source, there being associated with said at least one mount said at least two vanes which are mounted with the ability to move on said at least one mount and arranged on said at least one mount symmetrically with respect to one another about said main direction of emission (X).
 6. The lighting device according to claim 4, wherein said actuating device comprises an actuator and a moving part to which said at least one vane associated with said at least one mount is articulated, said actuator being suited to moving said moving part with respect to said at least one mount in such a way as to cause said at least one vane associated with said at least one mount to pivot simultaneously with respect to said at least one mount between said rest position and said emission position.
 7. A lighting device for motor vehicles, said lighting device being designed to emit light in a main direction of emission (X) and comprising: at least one vane mounted with the ability to move in said lighting device, said at least one vane having a panel on which at least one area light source is arranged, wherein said lighting device further comprises at least one mount fixedly mounted in said lighting device, said at least one vane being mounted with the ability to move on said at least one mount, and in that said lighting device further comprises an actuating device configured to cause said at least one vane to move with respect to said at least one mount between a rest position and the emission position, wherein said at least one vane is articulated to said at least one mount, said at least one area light source being suited to emitting light in a favored direction of radiation (Y), and in that said actuating device is suited to causing said at least one vane to pivot with respect to said at least one mount between said rest position and said emission position in which said favored direction of radiation (Y) of said at least one area light source is close to said main direction of emission (X) or corresponds more or less to said main direction of emission (X) of said lighting device, wherein said actuating device comprises an actuator and a moving part to which said at least one vane associated with said at least one mount is articulated, said actuator being suited to moving said moving part with respect to said at least one mount in such a way as to cause said at least one vane associated with said at least one mount to pivot simultaneously with respect to said at least one mount between said rest position and said emission position, and wherein said at least one mount comprises at least one guide groove in which said moving part of said corresponding actuating device can move.
 8. The lighting device according to claim 6, wherein said at least one vane comprises the connecting arm of which a first end is fixed to said panel, and of which a second end is, on the one hand, fixe to said at least one mount via a first axis (A1) and, on the other hand, fixed to said moving part via a second axis (A2).
 9. The lighting device according to claim 8, wherein said second end of said connecting arm comprises an orifice to accept said second axis (A2), said orifice having a cylindrical overall shape of oblong cross section.
 10. A lighting device for motor vehicles, said lighting device being designed to emit light in a main direction of emission (X) and comprising: at least one vane mounted with the ability to move in said lighting device, said at least one vane having a panel on which at least one area light source is arranged, wherein said lighting device further comprises at least one mount fixedly mounted in said lighting device, said at least one vane being mounted with the ability to move on said at least one mount, and in that said lighting device further comprises an actuating device configured to cause said at least one vane to move with respect to said at least one mount between a rest position and the emission position, wherein said at least one vane is articulated to said at least one mount, said at least one area light source being suited to emitting light in a favored direction of radiation (Y), and in that said actuating device is suited to causing said at least one vane to pivot with respect to said at least one mount between said rest position and said emission position in which said favored direction of radiation (Y) of said at least one area light source is close to said main direction of emission (X) or corresponds more or less to said main direction of emission (X) of said lighting device, and wherein said lighting device comprises at least two mounts which are fixed with respect to housing and in that said lighting device further comprises a framework that is fixed relative to said housing and on which said at least two mounts are arranged, said at least two mounts being spaced apart along said framework.
 11. The lighting device according to claim 10, wherein said lighting device further comprises a control unit suited to causing said at least one vane to move according to an actuation sequence during the course of which said at least one vane associated with said at least two mounts are moved between their said rest position and said emission position sequentially from said at least two mounts to another in a given direction of travel over said framework.
 12. A method for using said lighting device according to claim 1, said method involving: switching on said at least one area light source, said at least one area light source forming a film of light covering all or part of said panel of said at least one vane.
 13. The method according to claim 12, said method being implemented by means of said lighting device wherein said at least one area light source is an organic light emitting diode covering all or part of a surface of said panel of said at least one vane, said method further involving moving said at least one vane between said rest position and said emission position by means of an actuating device.
 14. The method according to claim 13 implemented by means of said lighting device comprising at least two mounts which are fixed with respect to a housing, a framework that is fixed relative to said housing and on which said at least two mounts are arranged, said at least two mounts being spaced apart along said framework, said method involving: switching on all of said at least one area light sources of said lighting device, moving said at least one vane between said rest position and said emission position, said at least one vane associated with said at least two mounts being pivoted simultaneously, said at least one vane respectively associated with said at least two mounts being pivoted with a temporal offset in a predefined order along said framework.
 15. The method according to claim 13 implemented by means of said lighting device comprising a control unit suited to causing said at least one vane to move according to an actuation sequence during the course of which said at least one vane associated with at least two mounts are moved between their said rest position and said emission position sequentially from said at least two mounts to another in a given direction of travel over a framework, in which said at least one vane associated with said at least two mounts are pivoted between their said rest position and said emission position sequentially from said at least two mounts to another in a given direction of travel over said framework.
 16. The lighting device according to claim 2, wherein said lighting device further comprises at least one mount fixedly mounted in said lighting device, said at least one vane being mounted with the ability to move on said at least one mount, and in that said lighting device further comprises an actuating device configured to cause said at least one vane to move with respect to said at least one mount between a rest position and an emission position.
 17. The lighting device according to claim 1, wherein said at least one vane is articulated to at least one mount, said at least one area light source being suited to emitting light in a favored direction of radiation (Y), and in that an actuating device is suited to causing said at least one vane to pivot with respect to said at least one mount between a rest position and an emission position in which said favored direction of radiation (Y) of said at least one area light source is close to said main direction of emission (X) or corresponds more or less to said main direction of emission (X) of said lighting device.
 18. The lighting device according to claim 5, wherein said actuating device comprises an actuator and a moving part to which said at least one vane associated with said at least one mount is articulated, said actuator being suited to moving said moving part with respect to said at least one mount in such a way as to cause said at least one vane associated with said at least one mount to pivot simultaneously with respect to said at least one mount between said rest position and said emission position.
 19. The lighting device according to claim 7, wherein said at least one vane comprises a connecting arm of which a first end is fixed to said panel, and of which a second end is, on the one hand, fixed to said at least one mount via a first axis (A1) and, on the other hand, fixed to said moving part via a second axis (A2).
 20. A method for using said lighting device according to claim 11, said method involving: switching on said at least one area light source, said at least one area light source forming a film of light covering all or part of said panel of said at least one vane. 